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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c225f7a22cbb8aa6ab5b20d7dbaa0ff27aad0036454e20f6f09697dd43a3b3' 
  AND token = '007pg6Tr0MjUJ8PzxQIyxzQL8A+x7HMZu5ibSKzNqAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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