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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5742d36867b6966e26a7db74367e6ba5bae5896d5d73a567fc2f78d4d9b16ff' 
  AND token = 'G6VE5lt/g8xbz3nTPqS5ISVgZw7T2VWPxkFtTEA+PD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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