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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1fb99c89027c91931d5a550225ad95bcb3ae1e0ae33b31cf3bce5289fa9d71' 
  AND token = 'lQqdA9XaLc+Pnhm/m2VhTPvJB5+Vnx41wX5jY10E6qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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