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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470d2c611db86c316e38dd38bc2652ab541cd8533f2f5db295acef0a12214a26' 
  AND token = 'xzhPQI1tuhwJvEYxbLlV1wY3gwBpz6WO46eJ6/AiWfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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