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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b183bc28bf36d4d73080120d6af4530ada9912d4ebfb25642a328d368e3e04' 
  AND token = 'mY2NCYyc+w+FBg8J/IDf8c8FU70k2J0InarCM985yz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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