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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd5f1ba558043b14bcb5f42aa0f38eda04e6d57fe4fcbd2597cc47621688b90' 
  AND token = 'Djicx7GhB6ls7zAc3wExxW17hGkfzXbk2SB0uHz3pMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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