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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23deb7e7b6440c75d5bd5efdac5d857a565e33492cab5786742ab437378f431' 
  AND token = 'dtC+w74r7rG0jXdJ4po8xms0smZunW9nZucwV6TI6n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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