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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbd6d27e89ea985562872fdbe744de02fc47416bc985bf6f3421b4b8e510a67' 
  AND token = 'dUmo2PdZWkFLGNE4t3gPgoYblfaNlj08qdcHQHY0wUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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