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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d54f8cfe0a259a5d29ff9962b5c72f31913a599705e3acb46357342eed2c6a' 
  AND token = 'w+7/z/o0irIH30aUM1GJihDnoOQJK1B9zJafnCw55PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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