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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8115a70e18750dcc66c52afec21191c8ea5a02d625f14d8999f2286f7d5935d3' 
  AND token = '9yhossDV8VOXNILxePbwpy26IWB2PqqULAkF/uk9O6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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