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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fe73bffd8ae1074b2ccd734f152b89d7b7f78446a952e0e66d8bc603c71a71' 
  AND token = 'G9qxAQiRucXTdCeuKxrtCzLoA5vyvjxlabWJtMIqW8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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