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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50169131fc3e6a505ec52240f08773c5a461125ff859b47e96733e55225cff47' 
  AND token = '6W0KuwlQqRHZe+GzrGjWA03sv+TxpmT1M0xki/sz588=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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