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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21e316fb439df390179663b11215cde5f4ae38e75de7b228d1c12fd9a0bffbd5' 
  AND token = 'C5aS40bgD5egzo2LzxmUMPJcXRGVvjFb38j5Sf8FoP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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