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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ade5b081d0aab78841d9e83cae2b5702091d3f550dc50cd7fe9a6448bfe887f' 
  AND token = 'sQGakcZXxaa9vOnAE3HBfEcfIS9/4REqZsvJBHzlEn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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