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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7c6e3d98a9b18623ce7aa427c0c4453735b787fd475874ce9f713ed71241f3' 
  AND token = 'qYjjYoB9MUCLXDAa0yAZv5ZWl5uN2Y51Ew+7R+Sakjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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