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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d07234a40122e7328322244020ed78eab236301988e665df2ab6c65fedbc0c' 
  AND token = 'yly73U+bvUIdBGOJqjtC8MetEdPygyM4RIpLOrfTNfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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