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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239df8ae84f92d8a64ac6833257a718165f8b14156a8ae30ea29ef77d026aad7' 
  AND token = 'Wct/KdsWlxoMTN3teEc8unNYlkPB2CeAUiYNAZUrw+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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