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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb92a56d20036918df5249efe2d060f49efd97662345b3adbdd9c60a860419a' 
  AND token = 'MDK1aGv4Z+CtwqI3qk8vqJDJh8ZJc3Uf4Af/QuJSDIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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