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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863712af84f1daf5bc5930f9a6928d8a71b2b040a314a4c77e536152a842a877' 
  AND token = 'a6tCo4Mk95k3I/acJ5Lg3rCwETcbmBrxl6NxtT7V1fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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