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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9591f48af9978e4d8a2858606f698eed8d7f1865648ded0f7086c16124f159af' 
  AND token = 'cmb4BSTfJScl2VqYxczZUl/mnAOE1jZSLqi6i9NWt9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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