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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06825d3b51e21444caefec84908c6f4a8f6003a440e1c1cb6efefca757257655' 
  AND token = 'oLr7BI/ABhsq46XoQD3YgM+NQ0mH+azX72xGc3wVQDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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