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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a09cd2e3af60c2ed3e72acfe3c1ab5cc79d933a71f7e0bcb285608120de12c' 
  AND token = 'Ilj5fpyOLE1wM3OrdLO2QY8aTsiKqKHvGKlabl/tQ/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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