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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4058bfe6579d7d6f699941ae1378b8b68a2acb014ac50c92d2d021c28d3fbb4' 
  AND token = 'tm5lyjhWNFiM/KL5UfcLkmRAsHu/MvrmLQn7X81XOVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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