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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bdf620528201b74d7b5b5780aefed2653ed18cacbf80e344e7b6b276a06899' 
  AND token = 'NdVwZah8bIzxrM33v4wcey0gom/Zw0foYRsqj/jHdrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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