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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf7fd3f6cdfdebac8c0885f6ad42107238c7cfdd1b4e6ace12ce2762c5fba9c' 
  AND token = 'napgo+UeHgGotAb86JxoUjMt8RVvr8ZgA/uE0Nhbqzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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