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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468342d404adda1f53fb42a35a8c88adb29fa86ca2f03480a800dbd6ff8875d8' 
  AND token = 'elLL06NrrH9iwFHJc/ozt+TBteueyMOwnWRdCDDYlh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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