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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32755adbc76c4c7d9f4229060ed5a18623e592cf19b9cfb83e9ed2b07ab68575' 
  AND token = 'NlZTxR4u/YFNWHjCVaK8EcRFksWjPLPk1hdtjIbktwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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