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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa98f95743982a6949f76cb233e839d67c1ac89cb0240e84d0007a070598f65f' 
  AND token = 'GGfHzjUMa6B0v7c3oLx4f9m2LniAVDP8x1WAZreVW+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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