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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07782b54c130c3689c37d17a13d2ef83713132da5e45189a5086509d8af8217' 
  AND token = 'gZLMpPO9SQ4+ZsYMFcgy2AIq/4eRGwdY1+YuqIKUm50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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