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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d334a9f1db7e7c37f05cf5a1f2d90cd385fe3a8370183a6405f0c028cde9ff' 
  AND token = 'E+7dwGmgEZ5/QCoCyX1Ehill1gP/4ZnZgVtsAaeA26g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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