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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0ad07528898202c5d97c4ad9f3aa3fa5b5bb1d96b6ecaa91988650db621d93' 
  AND token = 'zb6ujCOUZ+lXZ2AkhFSSifWi3QvtdS1g9DTtdDbfui8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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