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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a4bab1082f597011942729bb04e0bf981d79c983cee3cc2f8162348c3a66e2' 
  AND token = 'RtzHcd0WIjI5cRbjwl0kTZsGviNUhDMF1ZuyD8/P29s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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