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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d697b5e028671e04ac3b3dc4b6dfd61626c4cb0a46887ef9c74c8253ac4ea6' 
  AND token = 'szef1wm1aa1XCy6UY/Ar2o/Zaq0I8DC6S8RDIGOzXIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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