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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9093a54a59bb3fcc4676dd1a3814af14e8ccdcd464858b0f5e26444968e6a85c' 
  AND token = 'Mh4qV16ssCDoUH2B/AAorwgO4cdVQhqJS+thQ4Coqa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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