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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51eb675ee55024a54cc7e26ac35df076d874a70ddf2c285b80d4019977484d0f' 
  AND token = 'OQYs71XmjGoYc7OZsy6+ODEe7xxDJKJ5XB0HV46fw9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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