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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11696326184d4f03712c02e82705c7dcd822f7d8340c479f0d728cb26ada6d8c' 
  AND token = 'abISegjiInPHezEJQBfygFq9uew99H0Dj8rRhK0qll0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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