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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817b55a660d9532f27b45aef0c06f9af87cbfea6af35cf2fd85bb6a3746e5f7d' 
  AND token = '3BBeUJATrP0/uxJQTEku0UYmUOBrkSZfZy4G5CXZ5Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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