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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d7f657a00bd3e35219e688c306d1ace7522ea85cd4534e2f267a7acec9c042' 
  AND token = 'Ydw+TVXzAD5EKYYN0JiwygH+oRihgoSBD7zsPiJIJsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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