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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ff9b9183343b98e0dbd17e514dcc6a7bc99350cdfef3ac1e76060cfca7053c' 
  AND token = 'P6qyDuFbqkJ1kYlS9lvSFHwpESrGTx0G/ZoMGqFhqoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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