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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa03b81ab0f4d8f685e8ed3bdfd605b9b191366d8e1ed3e58a3f1254736eabb8' 
  AND token = 'ECPxP6RFNrs6/AMZqCFqG8EpRbqQ4Q5LIaB8MnmlGBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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