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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e015ba808923d7f8f252d0c795d10daa2acabb59d662bf27ca5686f18bd6b2' 
  AND token = 'cmB1WnbpxBxV+hjXiUMO4juZ5RRWpEqFtLuwdUxKu+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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