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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28387da8eafbb8dec53937bdbeb16ac6c1bc27c23aed7c45ecfae195dcbb8e8' 
  AND token = 'FyDYE2bn5aND3fn+7bnFPohHlgy+vwN3U4JLh+CT8P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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