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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcd09a32d6821f0719c2d703449f72bf792e27f516d1d89358b5be3d4cf37fc' 
  AND token = '2TeEg9cVFJDVxU9q3ED1tUKmY3r8dCEVmNjNtUQ9lfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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