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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1b54ebd7d0d61eee6551f6730ce318319f270b27568e5d4d3ae3ec0989d6f1' 
  AND token = 'ea2+Hmtb5nIxlIbX9N+nzYR9dQOeHYP2LWsy+7+kX8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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