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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd178528d433bf1337ad790a61c6e9e1be3fbb88e3c8b518cd42a2dfdca153c86' 
  AND token = 'ySNlWPMRuKTz8+oLQX/fHtnT/qX+qS+iX2C7jwwoThE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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