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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35de374dcb23fa660f0b4428acdc33ff67a4c137b9dc1aa316482c426db1b84' 
  AND token = 'lJZhjiEjB3ZwnMxHQCbqM9p87jaDZgBSk8lmHlAIwms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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