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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460b46488c699d8cd0a4a989dffb42ec9464a5fe5e8bdee3b8006804426f2d9e' 
  AND token = 'OJu8tuhJ8bQSd4JPLz0yONhlGVSDxuJvJ3QYeyXVBL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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