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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7e1b6c4ec368ff8a7e25bfec78154bfeb099c4e19568f5bb82aa00fc03d104' 
  AND token = 'rp5R3ouAa4VsskZ19YNqZwd04QpVU9Zd0DelvlWbeDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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