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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db288ca2a1ba33797a953e4614a20b6d10a2d3996889a680ac068bb4a19b243b' 
  AND token = '4A7JZF1cjtLkNQNfQc4Moz5jMsUFiGot3IrmqmycA6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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