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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103d1d6a285ffcdc0f01b029e49cc8f2f4600358b935c0aef8cf8b081e0582fb' 
  AND token = '7rZKydA9aqiH4LoG8ESjyzsiS9gqI7viGZxKY/IZUgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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