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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784fa039a99e1b615b36b8220f89f338d223befb680131ef9b8b98ad09f462ea' 
  AND token = 'a15O1xIlTfPwNJpggnVmaj29H5eehai4h3I7z49kefg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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