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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f5c3aab8fe782c957c8a29a32edf4b21df68bdc880f70e56638c0fc6ce3ffb' 
  AND token = '6eTpPz1nk1HhlO8EMY2lMaGiOEc/Er3O8UwveqTgaa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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