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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5689b1a5f1e6948327fb93be328b6d54a9150ed80eae8499cc1d019660fb49cc' 
  AND token = 'xk1uunHOt5k+SeyV31doRmOzzN67xnozVW4q00l2I9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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