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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ac2c677c10313ae547d4f25e597364c769424a711cc67007a15db5bb7894c8' 
  AND token = 'xDg2y4M8IlbQ2CxV7WgsFUUxa+S4w1iv+O0tONMecfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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