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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92dd490fdc031738f129025742277c14cad912fcd8fc112e282046c430e7b84' 
  AND token = 'KD3dGlsq+DrZRZRYQFwLkP7P3uZNYcB9ButYvZ6Q+os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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