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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84cd261b494a2ab60cff27aa1b70696e80bcafb4cd240e65d4095b05a147d8b9' 
  AND token = 'uHELjvMn6y5qT/JluSyd+4IxCvltItl4SeuqkLSPJVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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