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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ce39d874aa9082ab8a53e13721b4361c61c748277eb412c2714818ad149a3b' 
  AND token = 'ENn9+CH1EOVObkVVFU62T55vZMPS+JKl2IWje5KNNFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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