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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83051f9358cbbc4cc0d2bfbb400175d9a1a91b2ffefef56cc3138cb15dbba8ed' 
  AND token = 'pIoRLwg7Ebrbqp9lrJ4bAXq5spBwqTZ4D+eU31MjQCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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