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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248f3623bd6f6380b8d9e4899b62b70ee0b076c0885803116db18c121b36ba1e' 
  AND token = 'ersXX9sh6TtSteIeajFYdok0eWs6UiNgJTDdCbLN48Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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