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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba8cb85fad7e4689c54f45414a25a483523a848f11127b4fd1db76f73847965' 
  AND token = '8tJlm3HtomlyxgxEqz6H7oY//f4n62GN5G82WEYAbIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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