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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708e808038d57f83cf1e4232bf0fa58579d1b698dcd8fbf69ee320e96c268bee' 
  AND token = 'Is9z9S8Yka0lReD0BF5xeFBKXwtTE3uH1dirTlLcyWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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