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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a74be3d10b3d28d3652f6cd187722b501eab420719469862efb5c61a444d81' 
  AND token = 'R6Ecc/v60yb8ucM5f7CK2OqDc55JIy8FTr3S7VuldNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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