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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '187e562ee2aca197daad046faf2dbd95060db57018b6a8f9f1c1959e54041ecf' 
  AND token = '9byqqyJDfuD05DRg3R0jf3ep18SioHFtZlE9YHlGWFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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