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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b34688e24fb5422cbb19044797549fd7695d40f847d9620d221a45c24d447b' 
  AND token = '6KNPylJClAx6bNjO7zXS+R8XlZAX00k6Qk5IvwLvbxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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