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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e1fba5758f61c3d7c9c2716e725353c7052916a4daed7b5cf8edbcae6eaed4' 
  AND token = 'IzqKx7cE5nLBibNAFKee1Db84cbdbm4Dzzyy4CreOaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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