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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e93d02be790056e6b812fb87f023b1b2d674242e8956c17c9af60a9a0ac9e04' 
  AND token = 'j1xk+OIHcUc1ImdXHSQgFSzfKs/y/GGIg+v4b6V3nNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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