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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88c691eff257b4f55d5d5c645428fd949530b98bb17eb0365755b70bfb1ae24' 
  AND token = '7JJLB9sd5IlvoG7USJlPm5FDPhfEmHasTb2i86wbvc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}