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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4fa3ec0a5a79880c22bcebeb8244520b4f3c2e4cae3a1facb61f8315e624c19' 
  AND token = 'WNNmxudlQYP0p8YhSixC6pZVvQowMUPry0bbTNGNRzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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