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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1a3121fee683289c7f905a39e9d66f9830558bb5abb64577c426b6444baf2f' 
  AND token = 'kWs4xXdYEyQZpn3IUXbN+zPHIPxUGzbzkuNO8vv5l3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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