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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db4bf10db0bf27ae6c222bbc2e2db507c0424d14e511f38653469f99a0ab84f' 
  AND token = '67vpAv42jSd77ONSPpSw44GNhgUpM48NdviPwnSDwUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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