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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846fc7f605bff33a387c710bcd5fe77c2ef2deee85c631bca930dcc436193eb8' 
  AND token = 'Qx2v94mLymFqToB4l4+vt57j+B6b2jXamlXGTbRAXwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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