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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a062927a92fabaea4f46c355cc9661fce4cb6b71b2ef51e749f941847399df' 
  AND token = 'cyeQAiqOEIpAYub5D//IWz8OR0LY9KNR1fPhR7gs01o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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